Abstract: In order to assess degradation trends of lambda-cyhalothrin in different kinds of eco-environment planted apple.The field trail were conducted in suburbs of Taiyuan,Kunming and Beijing city,the apples and soils were analyzed by gas chromatography with ECD detector.The result showed that the degradation behaviors of lambda-cyhalothrin accorded with first order kinetics,the half life were from 17.8 to 24.0 days in apple,12.1 to 15.8 days in soil respectively.The last application was done 21 days before harvesting,the residues in apple and soil were not more than 0.2 mg/kg that was the maximum residues limits.The rate of degradation in three sites related to the air temperature and soils characteristic of physics and chemistry,but the difference was not significant.so it is safe to apply lambda-cyhalothrin.

Key words: Lambda-cyhalothrin, Apple, Soil, Residues

CLC Number: 

• S661.1